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#1
10-09-2007, 12:35 PM
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Spark Plug...US tables incorrect for Euro
My euro engine has a label on it with spark plug rec.
Says Bosch W7D Seems the US engine takes bosch W8D I ordered NGK BP5ES I found a cross ref table http://www.spark-plugs.co.uk/pages/technical/boschw5a-y6dc.htm says the bosch W7D translates into a different NGK BP6ES It would seem the NKG equiv to the bosch is the 6ES Will the 5ES not work as well? I wonder if Rusty will exchange them for correct part Really is quite hard to buy Euro parts even if you add a note that the engine is a Euro & if any parts are different to update.. I would assume its best to install the recommended plug... Should I return them/ get correct...is there big diff in these plugs? Does my engine run w a cooler plug? Seems higher NGK number is cooler http://www.ngksparkplugs.com/techinfo/spark_plugs/partnumberkey.pdf Would my engine at 196K be ok or better w a hotter plug? Thanks 
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~Shadow~  83 500 SEC Euro 198K Last edited by CamelotShadow; 10-09-2007 at 12:41 PM. 
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#2
10-09-2007, 12:54 PM
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The 5es are fine for high milage engines.
We usually go with W9 in the Bosch on high milage engines , so I would stay with the 5 in NGK..if you find them on the hot side after a few miles . just open them up a few thousands. NGK plugs are far better than any other plug for vintage Benz. including Bosch, specially if you get ones made in India...
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#3
10-09-2007, 12:59 PM
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So its ok & preferred to go a lil hotter w a hi mileage engine...
Lucky mistake on my part for not checking into the conversion... I don't know what plug is in there I have never pulled a plug so I may have to have them installed I might try to pull a plug now that the wires are due to be delievered today. wouldn't touch the wires on the car before I had new as they are really old & the rubber might just break. They say Germany Thanks!!!!  I'm glad I got the NGK prices similar to bosch & non resistor... I hope I did ok by ordering the bosch ignition wires... I hear Beru is better just hope Bosch wires are stiill good quality.
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~Shadow~ 83 500 SEC Euro 198K Last edited by CamelotShadow; 10-09-2007 at 01:07 PM.
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#4
10-09-2007, 04:48 PM
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is this plug 5/8 hex?
I tried my 5/8 spark plug socket on it & the socket is not deep enough too reach hex area? 
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~Shadow~ 83 500 SEC Euro 198K
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#5
08-10-2013, 12:34 AM
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My 83 euro 500 sec is running NKG BP5ES & runs fine also.
Oem spec plug on engine label is Bosch W7D or Beru 14 7D Found cross ref equiv to BP6ES. Bosch sites are confusing Say BP6ES is equiv to WR7DC Same bosch site matches WR8DC which should be a cooler plug with the much hotter BP5ES. This seems to suggest BP5 is cooler than BP6 which it is not. Alo this site lists slightly hotter plugs for hi mileage engines or lots of idle & short trip stop * go driving. That makes sense to help prevent fouling. Thats why I went a slight hotter. I have had no problems with the car but wondering if this could affect the smog??/ Also reinforces that you have to run correct FA ratio.... About Spark Plugs Now I'm getting lost...just want the best for my beast. 
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~Shadow~ 83 500 SEC Euro 198K
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#6
08-10-2013, 10:57 AM
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The hotter plug you are running will not adversely affect emissions and will probably help them. The recommended plug for your Euro 500 in Germany was 1 heat range cooler than in the US because in Germany most cars are operated at high speeds (think over 100 mph) for extended periods of time which would kill the US spec plug and/or engine. Did you ever get all of your vacuum/engine management hoses replaced? Mark
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